Bearing sealing structure and grinding machine

Abstract

The utility model belongs to the technical field of mechanical sealing, and discloses a bearing sealing structure and a grinding machine, which are used for sealing a gap between a bearing and a shaft, and the bearing sealing structure comprises a static fixed seat and a dynamic spacer sleeve. The static fixing seat is provided with the mounting hole, the bearing is mounted in the mounting hole, and the static fixing seat is in sealing fit with the shaft, so that water vapor and copper powder particles can be effectively prevented from permeating into the bearing from a gap along the outer surface of the shaft, and the bearing is sealed in the axial direction. The dynamic spacer sleeve is arranged on the shaft in a sleeving mode and fixedly connected with the shaft, the dynamic spacer sleeve is in sealing fit with the shaft, water vapor can be effectively prevented from permeating into the bearing from a gap along the outer surface of the shaft, meanwhile, copper powder particles are effectively prevented from permeating, abrasion to the sealing position of the static fixing base and the shaft is avoided, and the bearing is further sealed in the axial direction. The dynamic spacer sleeve and the static fixing base are matched in a nested mode and rotationally connected, abutting faces are annularly arranged on the dynamic spacer sleeve and the static fixing base in the axial direction, and the two abutting faces are attached in a sealed mode.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seals, in particular to a bearing seal structure and a grinding machine. Background Art

[0002] In order to remove burrs, bumps, depressions and other defects on the circuit board surface, make the circuit board surface flat and smooth, reduce contact resistance and improve signal transmission efficiency, the circuit board surface needs to be polished.

[0003] When grinding circuit boards, grinders generate copper powder particles. This process requires a spray device to spray the high-speed grinding brushes, generating a large amount of water vapor inside the machine. This water vapor and copper powder particles can penetrate along the back pressure wheel mounting area, corroding the bearings and causing them to rust and fail. These can also penetrate the machine body and corrode external components, seriously affecting the stability of the equipment. Therefore, the bearings must be sealed to isolate them from the water vapor and copper powder particles.

[0004] The existing bearing sealing structure mainly seals the gap between the bearing and the shaft through a sealing ring, which can only block part of the water vapor and cannot effectively seal. After long-term use, the sealing structure will wear out, thereby reducing the sealing effect. Water vapor and copper powder particles will penetrate into the bearing, causing the bearing to rust and fail, affecting the stability of equipment operation, reducing the grinding effect, and affecting the quality of the circuit board. Utility Model Content

[0005] The purpose of the utility model is to provide a bearing sealing structure and a grinding machine, which can effectively prevent water and copper powder particles from penetrating into the bearing, thereby extending the service life of the bearing, and has a simple structure and is easy to install and maintain.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] In one aspect, a bearing sealing structure is provided for sealing a gap between a bearing and a shaft, the bearing sealing structure comprising:

[0008] A static fixing seat, wherein the static fixing seat is provided with a mounting hole, the bearing is mounted in the mounting hole, and the static fixing seat is in sealing cooperation with the shaft;

[0009] A dynamic sleeve is sleeved on the shaft and fixedly connected to the shaft, the dynamic sleeve is sealed with the shaft, the dynamic sleeve is nested with the static fixing seat and is rotatably connected, and both the dynamic sleeve and the static fixing seat are provided with abutment surfaces along the axial ring, and the two abutment surfaces are sealed and fitted.

[0010] As a preferred solution of the above-mentioned bearing sealing structure, a first groove is provided on a side of the dynamic sleeve facing the static fixing seat, and the static fixing seat partially extends into the first groove.

[0011] As a preferred solution of the above-mentioned bearing sealing structure, a first protrusion extends circumferentially on the outer wall of the portion of the static fixing seat extending into the first groove, and the first protrusion is matched with the side wall gap of the first groove to form a labyrinth sealing gap between the nested portion of the static fixing seat and the dynamic sleeve.

[0012] As a preferred solution of the above-mentioned bearing sealing structure, a plurality of first protrusions are provided along the axial direction of the static fixing seat.

[0013] As a preferred solution of the above-mentioned bearing sealing structure, the bearing sealing structure also includes a first seal, the dynamic sleeve is provided with a second groove along the axial direction, the first seal is installed in the second groove, and the first seal is interference fit with the dynamic sleeve and the shaft.

[0014] As a preferred embodiment of the above-mentioned bearing sealing structure, the bearing sealing structure further includes a second seal fixedly connected to a static fixing seat, the second seal being arranged between the bearing and the dynamic sleeve and abutting against the bearing, the second seal being interference fit with the shaft and being relatively rotatable.

[0015] As a preferred solution of the above-mentioned bearing sealing structure, the dynamic sleeve is connected to the shaft via a connecting piece.

[0016] As a preferred solution of the above-mentioned bearing sealing structure, the dynamic sleeve extends into the mounting hole, and a second protrusion extends circumferentially on the outer wall of the part of the dynamic sleeve extending into the mounting hole, and the second protrusion is matched with the side wall clearance of the mounting hole to form a labyrinth sealing gap between the static fixing seat and the nested part of the dynamic sleeve.

[0017] As a preferred solution of the above-mentioned bearing sealing structure, the bearing sealing structure also includes a sealing sleeve, which is arranged at the nested position of the static fixing seat and the dynamic stop sleeve, and the sealing sleeve is connected to the static fixing seat. A third protrusion extends circumferentially on the outer wall of the sealing sleeve, and the third protrusion is gap-matched with the dynamic stop sleeve to form a labyrinth sealing gap between the sealing sleeve and the dynamic stop sleeve.

[0018] On the other hand, a grinding machine is provided, including a body plate, a back pressure wheel, a shaft, a bearing and the above-mentioned bearing sealing structure, wherein a positioning hole is provided on the body plate, the static fixing seat is installed in the positioning hole, and the back pressure wheel is sleeved on the shaft and can rotate synchronously with the shaft.

[0019] Beneficial effects of the utility model:

[0020] The utility model provides a bearing sealing structure and a grinding machine for sealing the gap between the bearing and the shaft. The bearing sealing structure includes a static fixing seat and a dynamic stop sleeve. The static fixing seat is provided with a mounting hole, and the bearing is installed in the mounting hole. The static fixing seat cooperates with the shaft seal to effectively prevent water vapor and copper powder particles from penetrating from the gap along the outer surface of the shaft to the bearing, so as to seal the bearing in the axial direction. The dynamic stop sleeve is sleeved on the shaft and fixedly connected to the shaft. The dynamic stop sleeve cooperates with the shaft seal to effectively prevent water vapor from penetrating from the gap along the outer surface of the shaft to the bearing, and effectively avoids the infiltration of copper powder particles, causing wear on the sealing part between the static fixing seat and the shaft, and further seals the bearing in the axial direction. The dynamic stop sleeve is nested with the static fixing seat and is rotatably connected. Abutment surfaces are provided on both the dynamic stop sleeve and the static fixing seat along the axial ring. The two abutment surfaces are sealed and fit together, effectively preventing water vapor from penetrating into the bearing, so as to seal the bearing in the radial direction. Through three sealing mechanisms—the dynamic sleeve and shaft seal, the dynamic sleeve and static retainer nesting, and the static retainer and shaft seal—the bearing is fully sealed in both the axial and radial directions. This effectively prevents water and copper powder particles from penetrating the shaft's outer surface through the gap and into the bearing. It also prevents water from leaking from the bearing into the machine body, potentially impacting overall structural operation. As the shaft rotates, the dynamic sleeve rotates synchronously with the shaft, preventing relative motion between the two. This prevents wear on the dynamic sleeve, ensuring it lasts through its service life and lasts for a long time. The static retainer and dynamic sleeve are rotatably connected, allowing them to rotate relative to each other as the shaft rotates. This bearing sealing structure effectively prevents water and copper powder particles from penetrating the bearing, while also preventing wear and tear. This ensures a long-lasting, effective seal, extending the bearing's service life, ensuring stable equipment operation, improving grinding efficiency, and enhancing circuit board quality, thereby enhancing the equipment's market competitiveness. Its simple structure also makes it easy to install and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is one of the schematic diagrams of the bearing seal structure provided by the embodiment of the present utility model;

[0022] Figure 2 This is the second schematic diagram of the bearing seal structure provided by the embodiment of the present utility model;

[0023] Figure 3 This is a structural diagram of the bearing seat and the second sealing member provided in an embodiment of the present utility model;

[0024] Figure 4 This is a schematic structural diagram of a dynamic stopper provided by an embodiment of the present utility model;

[0025] Figure 5 yes Figure 3 A partial enlarged view of point A in the middle;

[0026] Figure 6 It is a structural schematic diagram of the grinding machine provided by an embodiment of the present utility model.

[0027] In the picture:

[0028] 1. Static fixing seat; 11. Mounting hole; 12. First protrusion; 2. Dynamic stop sleeve; 21. First groove; 22. Second groove; 23. Screw hole; 3. First seal; 4. Second seal; 5. Shaft; 6. Bearing; 7. Body plate; 8. Back pressure wheel. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0030] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0031] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0033] On the one hand, if Figure 1-Figure 3 As shown, this embodiment provides a bearing sealing structure for sealing the gap between the bearing 6 and the shaft 5. The bearing sealing structure includes a static retainer 1 and a dynamic sleeve 2. The static retainer 1 is provided with a mounting hole 11, into which the bearing 6 is mounted. The static retainer 1 and the shaft 5 are sealed together, effectively preventing moisture and copper powder particles from penetrating along the outer surface of the shaft 5 from the gap into the bearing 6, thereby sealing the bearing 6 in the axial direction. The dynamic sleeve 2 is sleeved on the shaft 5 and fixedly connected to the shaft 5. The dynamic sleeve 2 and the shaft 5 are sealed together, effectively preventing moisture from penetrating along the outer surface of the shaft 5 from the gap into the bearing 6, while also effectively preventing copper powder particles from penetrating and causing wear on the seal between the static retainer 1 and the shaft 5, further sealing the bearing 6 in the axial direction. The dynamic sleeve 2 and the static retainer 1 are nested and rotationally connected. Both the dynamic sleeve 2 and the static retainer 1 are provided with abutment surfaces along the axial ring. The two abutment surfaces are in sealing contact, effectively preventing moisture from penetrating into the bearing 6, thereby sealing the bearing 6 in the radial direction.

[0034] Through three sealing mechanisms—the dynamic sleeve 2 sealingly mating with the shaft 5, the dynamic sleeve 2 nesting with the static retainer 1, and the static retainer 1 sealingly mating with the shaft 5—a comprehensive axial and radial seal is achieved for the bearing 6. This effectively prevents water and copper powder particles from penetrating the gap along the outer surface of the shaft 5 and into the bearing 6. It also prevents water from leaking from the bearing 6 outside the machine body, potentially impacting the overall operation of the structure. When the shaft 5 rotates, the dynamic sleeve 2 rotates synchronously with the shaft 5, meaning that the dynamic sleeve 2 and the shaft 5 do not experience relative motion. This prevents wear on the dynamic sleeve 2, ensuring that the dynamic sleeve 2 will not fail within its service life and providing long-term, effective sealing. The static retainer 1 and the dynamic sleeve 2 are rotatably connected, enabling relative rotation between the static retainer 1 and the dynamic sleeve 2 when the shaft 5 rotates. This bearing sealing structure effectively prevents water and copper powder particles from penetrating into the bearing 6, and the seal structure is wear-resistant, ensuring long-term, effective sealing. This extends the service life of the bearing 6, enables stable operation of the equipment, improves grinding efficiency, enhances the quality of the circuit boards, and thus enhances the market competitiveness of the equipment. Furthermore, the structure is simple and easy to install and maintain.

[0035] Specifically, the bearing 6 is arranged at one end of the shaft 5, the outer ring of the bearing 6 is interference fit with the mounting hole 11, and the end of the static fixing seat 1 away from the dynamic sleeve 2 is provided with an annular abutment portion, and the side of the bearing 6 facing away from the dynamic sleeve 2 abuts against the abutment portion. In other embodiments, the end of the static fixing seat 1 close to the dynamic sleeve 2 is provided with an annular abutment portion, and the side of the bearing 6 facing the dynamic sleeve 2 abuts against the abutment portion to limit the position of the bearing 6. The dynamic sleeve 2 is interference fit with the shaft 5. The static fixing seat 1 is nested in the dynamic sleeve 2. The nested parts of the static fixing seat 1 and the dynamic sleeve 2 are clearance fit so that the static fixing seat 1 and the dynamic sleeve 2 can rotate relative to each other.

[0036] Alternatively, as Figure 2-Figure 5 As shown, a first groove 21 is provided on the side of the dynamic sleeve 2 facing the static fixing seat 1 , and the static fixing seat 1 partially extends into the first groove 21 so that the static fixing seat 1 is nested in the dynamic sleeve 2 .

[0037] Specifically, the end of the static mount 1 facing the dynamic sleeve 2 has an extension section with a reduced outer diameter. The outer diameter of the extension section is smaller than the inner diameter of the first groove 21, and the extension section can fully extend into the first groove 21. The end surface of the dynamic sleeve 2 facing the static mount 1 serves as an abutment surface, and the end surface of the static mount 1 provided with the extension section also serves as an abutment surface, and the two abutment surfaces are sealed and fitted.

[0038] Optionally, a first protrusion 12 extends circumferentially on the outer wall of the portion of the static mount 1 that extends into the first groove 21. The first protrusion 12 is clearance-matched with the sidewall of the first groove 21, so that the nested portion of the static mount 1 and the dynamic sleeve 2 forms a labyrinth seal gap, thereby blocking the passage of water and copper powder particles and effectively preventing water and copper powder particles from infiltrating into the bearing 6. Specifically, the first protrusion 12 is annular, and the end surface of the first protrusion 12 forms a labyrinth seal gap with the sidewall of the first groove 21.

[0039] Furthermore, multiple first protrusions 12 are provided along the axial direction of the static mount 1, forming a more complex labyrinth seal gap, further preventing water and copper powder particles from penetrating into the bearing 6. In this embodiment, two first protrusions 12 are provided. The specific labyrinth seal gap formed by the multiple first protrusions 12 can be designed based on actual sealing requirements and is not limited in this application.

[0040] Optionally, the bearing sealing structure also includes a first seal 3, and the dynamic sleeve 2 is provided with a second groove 22 along the axial direction. The first seal 3 is installed in the second groove 22. The first seal 3 is interference fit with the dynamic sleeve 2 and the shaft 5, so that the dynamic sleeve 2 and the shaft 5 are sealed and sealed, thereby realizing sealing of the bearing 6 in the axial direction.

[0041] Specifically, the second groove 22 is provided at the end of the dynamic sleeve 2 away from the static mount 1. The first seal 3 can be a skeleton seal ring or other type of seal ring, which is not limited in this embodiment. Taking the skeleton seal ring as an example, the outer ring of the skeleton seal ring has an interference fit with the groove wall of the second groove 22, and the inner ring of the skeleton seal ring is provided with a lip that has an interference fit with the outer wall of the shaft 5, forming a gapless seal structure with the outer wall of the shaft 5. The first seal 3 rotates synchronously with the shaft 5 and the dynamic sleeve 2.

[0042] Optionally, the bearing sealing structure also includes a second seal 4 fixedly connected to the static fixed seat 1. The second seal 4 is arranged between the bearing 6 and the dynamic sleeve 2 and abuts against the bearing 6. The second seal 4 is interference fit with the shaft 5 and can rotate relative to it, so that the static fixed seat 1 and the shaft 5 are sealed together, further realizing sealing of the bearing 6 in the axial direction.

[0043] Specifically, the second seal 4 forms an interference fit with the sidewall of the mounting hole 11, securing the second seal 4 to the static mount 1. Furthermore, the second seal 4 forms an interference fit with the shaft 5, creating a tight seal between the two. Consequently, when the shaft 5 rotates, the second seal 4 and the static mount 1 remain stationary. In this embodiment, the second seal 4 is a skeleton seal ring, the inner ring of which is provided with a lip. This lip forms an interference fit with the outer wall of the shaft 5, forming a seamless seal.

[0044] Optionally, the dynamic sleeve 2 is connected to the shaft 5 through a connecting piece to improve the installation stability of the dynamic sleeve 2 and prevent the dynamic sleeve 2 and the shaft 5 from rotating synchronously. The relative rotation between the dynamic sleeve 2 and the static fixed seat 1 will cause large friction, which will affect the rotation of the dynamic sleeve 2.

[0045] Specifically, the connecting member can be a screw, and a plurality of screw holes 23 are provided along the circumferential spaced ring of the dynamic sleeve 2. Threaded holes are provided on the shaft 5 at positions corresponding to the screw holes 23. The screws are passed through the screw holes 23 and are threadedly connected to the threaded holes. In other embodiments, the dynamic sleeve 2 and the shaft 5 can also be connected by a pin or key.

[0046] In another embodiment, the dynamic sleeve 2 extends into the mounting hole 11, and a second protrusion extends circumferentially on the outer wall of the portion of the dynamic sleeve 2 extending into the mounting hole 11. The second protrusion is clearance-matched with the side wall of the mounting hole 11 so that the nested portions of the static fixing seat 1 and the dynamic sleeve 2 form a labyrinth sealing gap.

[0047] Specifically, the end of the dynamic sleeve 2 facing the static fixing seat 1 has an extension section with a reduced outer diameter. The outer diameter of the extension section is smaller than the inner diameter of the mounting hole 11, and the extension section can be fully extended into the mounting hole 11. The end face of the static fixing seat 1 facing the dynamic sleeve 2 is an abutment surface, and the end face of the dynamic sleeve 2 provided with the extension section is also an abutment surface, and the two abutment surfaces are sealed and fitted. The second protrusion is annular, and multiple protrusions are provided along the axial direction of the dynamic sleeve 2. The end face of the second protrusion forms a labyrinth sealing gap with the side wall of the mounting hole 11. The labyrinth sealing gap formed by the specific multiple second protrusions can be designed according to the actual sealing requirements, and this application does not limit this.

[0048] In other embodiments, the bearing sealing structure also includes a sealing sleeve, which is arranged at the nested position of the static fixing seat 1 and the dynamic stop sleeve 2, and the sealing sleeve is connected to the static fixing seat 1. A third protrusion extends circumferentially on the outer wall of the sealing sleeve, and the third protrusion is gap-matched with the dynamic stop sleeve 2 to form a labyrinth sealing gap between the sealing sleeve and the dynamic stop sleeve 2.

[0049] Specifically, the static fixing seat 1 has an extension section with a reduced outer diameter at one end facing the dynamic stop sleeve 2. The sealing sleeve is arranged on the extension section and has an interference fit with the static fixing seat 1. The outer diameter of the sealing sleeve is smaller than the inner diameter of the first groove 21, and the sealing sleeve is completely inserted into the first groove 21. The end face of the dynamic stop sleeve 2 facing the end of the static fixing seat 1 is an abutment surface, and the end face of the static fixing seat 1 provided with the extension section is also an abutment surface, and the two abutment surfaces are sealed and fitted. The third protrusion is annular and fits in the gap with the side wall of the first groove 21. The end face of the third protrusion forms a labyrinth sealing gap with the side wall of the first groove 21. There are multiple third protrusions arranged along the axial direction of the sealing sleeve. The labyrinth sealing gap formed by the specific multiple third protrusions can be designed according to the actual sealing requirements, and this application does not limit this.

[0050] On the other hand, Figure 1 and Figure 6 As shown, this embodiment provides a grinding machine, which is characterized in that it includes a body plate 7, a back pressure wheel 8, a shaft 5, a bearing 6 and the above-mentioned bearing sealing structure, a positioning hole is provided on the body plate 7, the static fixing seat 1 is installed in the positioning hole, and the back pressure wheel 8 is sleeved on the shaft 5 and can rotate synchronously with the shaft 5.

[0051] Specifically, there are two bearings 6 and two bearing seals. Two bearings 6 are mounted on either end of the shaft 5, each equipped with a bearing seal. A body plate 7 is provided on either side of the grinder. Two static mounts 1 are mounted within positioning holes on the two body plates 7 and are sealed to the body plates 7 to prevent water from leaking outside the body plates 7 and affecting the overall operation of the grinder.

[0052] The bearing sealing structure on this grinding machine can operate for 2 years, with an actual operating time of more than 10,000 hours, and the bearing sealing structure is still intact, which effectively protects the bearing 6 from corrosion damage, effectively ensures the stable operation of the equipment, and guarantees the durability of the bearing sealing structure.

[0053] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A bearing sealing structure for sealing the gap between a bearing (6) and a shaft (5), characterized in that: The bearing sealing structure comprises: A static fixing seat (1), wherein the static fixing seat (1) is provided with a mounting hole (11), the bearing (6) is mounted in the mounting hole (11), and the static fixing seat (1) is in sealing engagement with the shaft (5); A dynamic stop sleeve (2) is sleeved on the shaft (5) and fixedly connected to the shaft (5); the dynamic stop sleeve (2) and the shaft (5) are sealed together; the dynamic stop sleeve (2) and the static fixing seat (1) are nested and rotatably connected; both the dynamic stop sleeve (2) and the static fixing seat (1) are provided with abutment surfaces along the axial ring, and the two abutment surfaces are sealed together.

2. The bearing sealing structure according to claim 1, characterized in that: A first groove (21) is provided on a side of the dynamic stop sleeve (2) facing the static fixing seat (1), and a portion of the static fixing seat (1) extends into the first groove (21).

3. The bearing sealing structure according to claim 2, characterized in that: A first protrusion (12) extends circumferentially on the outer wall of the portion of the static fixing seat (1) that extends into the first groove (21), and the first protrusion (12) is clearance-matched with the side wall of the first groove (21), so that the nested portion of the static fixing seat (1) and the dynamic stop sleeve (2) forms a labyrinth seal gap.

4. The bearing sealing structure according to claim 3, characterized in that: A plurality of the first protrusions (12) are arranged along the axial direction of the static fixing seat (1).

5. The bearing sealing structure according to any one of claims 1 to 4, characterized in that: The bearing sealing structure further comprises a first sealing member (3); the dynamic sleeve (2) is provided with a second groove (22) along the axial direction; the first sealing member (3) is installed in the second groove (22); and the first sealing member (3) is interference-fitted with the dynamic sleeve (2) and the shaft (5).

6. The bearing sealing structure according to any one of claims 1 to 4, characterized in that: The bearing sealing structure further comprises a second sealing member (4) fixedly connected to the static fixing seat (1); the second sealing member (4) is arranged between the bearing (6) and the dynamic sleeve (2) and abuts against the bearing (6); the second sealing member (4) and the shaft (5) are interference-fitted and can rotate relative to each other.

7. The bearing sealing structure according to any one of claims 1 to 4, characterized in that: The dynamic stop sleeve (2) is connected to the shaft (5) via a connecting piece.

8. The bearing sealing structure according to claim 1, characterized in that: The dynamic sleeve (2) extends into the mounting hole (11), and a second protrusion extends circumferentially on the outer wall of the portion of the dynamic sleeve (2) extending into the mounting hole (11), and the second protrusion is clearance-matched with the side wall of the mounting hole (11), so that the nested portion of the static fixing seat (1) and the dynamic sleeve (2) forms a labyrinth seal gap.

9. The bearing sealing structure according to claim 1, characterized in that: The bearing sealing structure further comprises a sealing sleeve, which is arranged at a nested position between the static fixing seat (1) and the dynamic sleeve (2), and is connected to the static fixing seat (1). A third protrusion is circumferentially extended on the outer wall of the sealing sleeve, and the third protrusion is clearance-matched with the dynamic sleeve (2) to form a labyrinth sealing gap between the sealing sleeve and the dynamic sleeve (2).

10. A grinding machine, characterized in that: The invention comprises a body plate (7), a back pressure wheel (8), a shaft (5), a bearing (6) and a bearing sealing structure according to any one of claims 1 to 9, wherein a positioning hole is provided on the body plate (7), the static fixing seat (1) is installed in the positioning hole, and the back pressure wheel (8) is sleeved on the shaft (5) and can rotate synchronously with the shaft (5).

Images